Knob for radio sets



Feb. 10, 1931. c, c, Q 1,791,798

KNOB FOR RADIO SETS FiledMay I5, 1929 25 2-2 of Figure 1.

Patented Feb. 10, 1931 CLAUDE 0. contac s CULVER, OREGON KNOB FOR RADIO SETS Application "flied May 15,

The present invention is'directed to improvements in knobs for radio sets.

The primary object of the invention is to provide a device of this character so constructed that it can be easily and quickl a plied or removed from a controlling sha t of the set.

Another object of the invention is to pro-* vide a device of this character capable of being firmly connected to the controlling shaft without the aid of set screws or clamps.

Another object of the invention is to provide a device of this kind so constructed that the knoband controlling shaft will be mainletained in proper alinement. 1 With these and other objects in view this invention resides in the novel features 0 construction, formation, combinationand arrangement of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawings, in which:

Figure l' is a longitudinal sectional vlew through the knob and shaft. Figure 2 is a sectional view on the l ne Figure 3 is afragmentary perspective View of the controlling shaft.

Figure 4 is an end View of the bushing before being applied to the knob for the recep-. tion of the shaft and sleeve.

Referring to the drawing, the numeral designates a portion of a COIltIOlllIl" shaft servlng to adjust the condenser or other element of a radio instrument, said shaft having a metallic sleeve 2 soldered thereon, the outer surface of said sleeve being tapered.

This sleeve is provided upon its ma or outer surface with longitudinally extending corrugations or ribs 3, the purpose ofwhich.

will be later explained.-

The turning knob 4 is formed from any suitable materlal and is provided with a sock- I et 5 and pressed into this socket is a soft rubber bushing 6.

- As shown in Figure 1 of the drawing, the outer end of the shaft 1 is engaged in the bore 7 of the bushing and owing to the tapered formation of the sleeve 2, the bushing will be expanded to cause the same tofirmly grip the wall of the socket to prevent turning thereof 1929. Serial no. 363,379.

in said socket. The shaft is pressed into the bore 7 of the bushing until the inner end thereof engages the base of the socket and at which time the corrugations or ribs 3 will be r confined within the bushing. Since the corrugations or ribs are now pressed into the bushing, relative rotation of the shaft and bushing is positively prevented.

' The knob can be easily and quickly pulled from the shaft when desired and readily replaced and owing to the presence of the bush ing 6, the knob can be firmly secured to the shaft without using set screws or clamps. I From the foregoing, it is thought that the operation and many advantages of the herein described invention will be appanent to those skilled in the art, without further description, and it will be understood that various changes in size, shape, proportion and minor details of construction may be resorted to' Without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus described the invention, what 1 is claimed is:

1. Ina radio receiving set, the combination with the shaft of one of the instruments thereof, of a tapered sleeve mounted on the a shaft and having its greatest diameter spaced from the outer endof the shaft, a control knob having an axial socket, anda compressible bushing in the socket, said sleeve entering said bushing and expanding the bushing when said knob is applied to said shaft Whereby to frictionally hold said knob and said shaft against relative rotation, said knob being removable from said shaft by the same being pulled forwardly from the shaft. 2. A radio control knob for operating the shaft of a receiving set instrument, comprising a knob having an axial socket extending to nearly the outer end of the knob for receiving said shaft therein, a compressible rubber bushing snugly fitting in said socket and extending longitudinally thereof to said outer end, and a tapered sleeve adapted to be fixed to the outer end ofsaid shaft and having'its diameter of greatest -dimension spaced remote. from the outer end of said shaft, said sleeve being provided with corrugations on said diameter of greatest dimension, said 100 sleeve serving progressively 'expandJthe bore of said bushing and compress the bushwhile said knob is-being applied to said shaft by forging said knob inwardly upon said shaft, said bushing and said sleeve c0acting in preventing relative rotation ofi-said knob and said shaft.

In testimony whereofI afiix my signia ture.

LAUDE C. COEN. s.] 

